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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d8bb5a2245aa1666b31ebb9d5eb1ff480863a13559e667ceaf91e4b19dccf3' 
  AND token = '3Uer7Td6MOZ+ZoU9+MpWDWwXkUqgt1FdFwI1KrGDb7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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