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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cafb8d2123e40c7c91a89256c85a943060df97328dadae83adac190112e39b0' 
  AND token = 'eK2k5VpdecT1JviuIOJSDKSyt0lcz423szP9wYBn9zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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