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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1521c69d1b76f0e8886926bbcd555315ebfb2b2ece12a0d7690e22afcfd0c38f' 
  AND token = '17eDdoUYkzy0AoFFAhT4k+JMs1G6xzvecP8zb5mzC8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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