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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1e5d604f75ed5a52d29411fc9e36d829a6f8b441eb09122fd1ff28b0a38e5a' 
  AND token = 'MR1OkFAqxE8kUqKS8+cwNmb5DQGVFSBJXSoo5Oc6nV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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