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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc1c4bcaee16a1cd3dc48caeb12824f461d502ac02a32dafe74c95a54ed2fb3' 
  AND token = 'ckWZ0hGDXiPP3AAXC06mxXLnGUOjl8sA5XWOsVh9IAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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