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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f3e9ae309deaa2f8ff63440e55d2ab1166a4510b03a4792ceb2c3efeb9de85' 
  AND token = 'oo01aFCEhCz2YbgT5qP3JeNC9Wi8n7lbD6ULq7lkLpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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