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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c42d954c622038c1dfefc069449cde22546ebf34a3a052f1fd3f3e589f1b32' 
  AND token = 'd08EQLlnlfzD16q3ebkPDuGKaTyoBjhYuiiW9kv+IOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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