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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6992ff0d486bec125b0cc7a36ce3469d2f01565146c5db6ac0ad91f53bbd3655' 
  AND token = 'pNG3e5VOTyZLif1QlTMQh1JHVFlLILgqoqDNufCU8u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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