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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c85e523ed7e0e03ecec0ee67387fe849011a1b1f9b36c6bc49d52ee6df05df' 
  AND token = 'uGGKluCziEtKn9vSc0xplg+LweRytedk2wcmqj6GohY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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