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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50accac02646ed8545f5f2d47eb8de679d74e42485e171ee6f2791bdc04fc780' 
  AND token = 'csdiccJco/n8VXB+r9BpaRnjuEEKhpi+UJYWuIHtDRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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