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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937d6471d1e6310a9c4c952b5b600509980f711ffdc11956d5be57635fea2da6' 
  AND token = '1Gl02+IYrC1MmcCFys3xXoteSvSswRfgChPKM5SNvVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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