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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c75ad8714601547a9ccf1528a53c1e4de7b1b07c79ec82a678c5fceccd6d81f' 
  AND token = 'qd/bn7SGcAFqkf3rXW2pHzH4dUeHt5o8QSsV8OB2IBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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