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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fed7c9f27fb483b86699a689686552cdd73b463428202928a8337c56604665' 
  AND token = 'VAYyUBqdp1KgFc124lIEnotq83vpT8oAvk5c99dPwEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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