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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd81850479d6ce7d4d15f49158ea8b5b50985c8a9d2a57db95d615a56151cff' 
  AND token = '2sTrHPFdV4EYklQWaLqvYtAhoIme54rNMEODQ6MxTgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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