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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6d7c3ae3c19618b591c169f7ad5bc4d9edbc61c69955fc49ae7bfc9945c6cf' 
  AND token = 'TjhxFPd0HzvCbosi0goyVW8iHzQ1rhJqDQajaHI+SJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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