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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713794541ba4d38c82a02c0d5a4cce41f037bc141a59c9d5b820c0148ae02a06' 
  AND token = 'PaW0a7zeIrZ4b5QIkyqL/QQ61NHB+XXRN2auLyf+XkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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