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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8862c4ba3dffe404e45842f868df350f2bfef6e52af78b09a42ca16a0809119' 
  AND token = '9Z7j5dM5TqR67WY/wCIgHsdMqosZ+sS/oIuKKgZuuT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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