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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ce44e4c5d47a5d47f8bac15a270a436b15b9317bb55b67cd34d50532ef9a8c' 
  AND token = 'HeOenPAgEjaF1EXVJluDXgaFcZBas9z7r3gAmaWdrR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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