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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df8d2faac0d1a27c764e1926651e1f08b50106e585ad6ea1950a76b8e10e6e7' 
  AND token = 'zw8oaaennyjbzt+btWV0uwXnbXyS4o0agHJ+4PAcW84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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