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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f0229c3acfca93327be427ece66334a7d30e456af3d39cc283679826f39799' 
  AND token = 'hwuzHx4SC2oTR59VIKMo7B3NJQ907Zrn3m3o/x6ws5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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