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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29a47d250311dc47e4ae5fcd690817570b74397bf7f0cfd51b2213ce14f50fc' 
  AND token = '8fMD0tFyLzQzsHcpVPFsxOdXIV4W0iuFHz3clhbuf7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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