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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b16ede39561b47559ad89524def00886b331b34054f5e052c9bd8f1b9ea17ac' 
  AND token = '1X7rrYj9/TMSUwveoaSBWpHXky+ES60KaD6se7d9EJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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