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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56ed8c12ebd09d7846d9eaa52114578301dd3831b57a20ff66e7e9f729aee77' 
  AND token = '48ISpTNjP/8xCpaweGBbcdCy490Qdx+s+MAOdUG6H1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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