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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4855c2e0332caba944fda94df06a701005e0d403ad10c9cbe5b5a926c2ad7ec' 
  AND token = '1XVgXVYAiPxWeqtAX39swYWVIwPDP42L/+rwGqtHS0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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