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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c96b2135bdf063311a70052351aba8f63758fb6c76d373ee8a897f7adb7864' 
  AND token = '10FpIgZUzI+Iovs5NNIbhCIx79l2JrxlltORXpRKT6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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