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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85b78b9a95821629388e809b6660a0b91edbc888e7ed41896a9aaf5e9586f3c' 
  AND token = '41UmU8DVyvN7xJ4mRHUbCOY/6/qCO010aNGVyHM3hhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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