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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805f6349028bfa52fed56fae69faa001c8f786d598fd266e1cb783c4533af9bf' 
  AND token = 'fzZtkj70C6jn1788LjA4vv9ZLHI/LLaMSh0jkrNN5KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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