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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66dc03d5ddb67025cf014b2f6db796854dc1a22a80d625b8cc95356b8878566' 
  AND token = 'YUHW1fYQDZmaDzNVry5d76VmtTfExmc0T1c7xLWUOHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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