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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe7976753f24764e539fae2f6dcb93337aedc3ca0995c15ed9d146730a78fdf' 
  AND token = 'Zb0yRN2ySt9nAaBNsl/Bi4zm3au+s/Y7z0KuZj4TkF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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