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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7b05ada60342643ce31e76a5ccc2c6509c446df64fca2d694b99164a2d3440' 
  AND token = '4xkxyPSo0CY1gcaVa3TDst4YuN2ddgB6Kz7WNQHr5t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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