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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86e106a9ed8d577070da8190e6ec4d537a53050ebc816f134dc6d1a4d40278e' 
  AND token = 'dt+xAfAJzaWA4mE5oS8jLJyRf6nDjFpmgSDc0gIv/ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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