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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c8c18b2fbbaa29fede077facd1eb271088f8329731ccb5fa76c82091a7af04' 
  AND token = 'h8fo4SdNW7Xzo7oUK5YuObhS7c+YruGOKxeJCb6pH9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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