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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94f7733bed69e9f14c60b7da2907aee293e7c78120ba49be32e8787a5e7a570' 
  AND token = 'lvWwz0iUS00H8V6F0yySPM2BeKdKQ4qbszFdOAX1LeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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