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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f552448d5393dd9aa947e641ff1ad123b250fa53720ed5e04224def6ebb66667' 
  AND token = 'Wn1x6cK4CECKDdGZSL2ndtLXMqO3AHTBm1d1B5BmBGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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