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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a13d9b747f68174ef1e474fc88025b72eba58e735be41f0182dd191831bf8d' 
  AND token = 'Nd4mUr488uPf4VIq2LILBTaWCn9ysbN4qWFORPFhA+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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