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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2362e1f24eb6f425878fb1fa207bdae96edc3fd0a33c4a4243c323b88988ef0' 
  AND token = '9VveNlyWjJEPH9AB2phQjFbgka4uXpywYh8dNwOQb94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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