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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18561e88d6dc6cc63b26dfcf99f1173ea8a3d1c2ed2c0462a2dc9acadcab72e2' 
  AND token = '4FdhO2M0qA0CrDqC21KdYgzfAdkiH8NEEgkBu8czTxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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