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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63a4f4962c154471243b61462ce6494c5ee3eaef14c60bf894dd0fadadb793b' 
  AND token = '1Sq9wtMOjf/ddXSqu3wNJETcElVLgGnVKKrDLHSscbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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