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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab51ba1fdca8703154e253b72922ad0d7062f6140976310aaa5df94a9639b0e9' 
  AND token = 'l0t4Ik/UP3b2HqjFcylk9eq02O+a6l40+15I6Tjsmpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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