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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9068aab8f89be1a9e28d78323c2731028cae5c16caf08c6ad99dbf62663781ac' 
  AND token = '8mqAsfySEkLDpMQDvtaaxfros1KGIf320peatqPEG1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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