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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772933d633a3440c3e857ecfab581af0f7cfdbbb299a8693ff6eeeac6402ba52' 
  AND token = 'FuANhKROcsngFJmH9tnoySA4iaBMGLXqLbGxZ1HspKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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