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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6bf64019ff70b214717217e997c90e3446abe8058957b7ccb1f97497869bde' 
  AND token = 'tbHwfa1674TG8RZPYjwBBxx3olLcDQ8d0cA77jV3rMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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