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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b6cf494e1745c8b4b3deb2d2c0ec1caaa068ed49eb8480f55290d8626a7582' 
  AND token = 'lZUTW86Fzdefx/IKHZiWKTJ/L75bB/Der1iQZGZYS/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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