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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c190e56b15591eff88c5e61b8a011126c5575e3f195ff7af38701b7aeddf85' 
  AND token = 'yf79hRc+AUYQA/HBgOn24v7WMlslkMspUei0yH3swus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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