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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe467a591914c1a636ae1e95462de5c4a1085302181560fa831164dfd5376c8' 
  AND token = 'ZtgvLH0fMZtZ6J4w36Eer2nZe6Q6v1qFb3zb5dK8JZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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