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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be8f0be0444ddca586e52333178942e361290bda47e949ba4d490e82c014fd2' 
  AND token = 'tK1QUkNQn49RpvZN1efB16G0ameDeVKRuXYysHIhkGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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