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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3755ce7a7d9385dc53fe2b603bbc9eb4fef9c5862d2003eaea198831e87b80b8' 
  AND token = 'FgNgEixqOaJ7KNJE2vv6gqhYHKEbH52746f9ueHsf7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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