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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe490428d6fc79b6e42ddf2be027bbd32524bd21d325d16b8f94ff9101ba30f1' 
  AND token = 'obf7tRS0xO7hnL/5f9qTmild55ffC+EHkr4lktb89P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}