SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b07f890771b85ce3cb93de1677d81ca1a9ee915c9178dd188a2f95bb4775428' 
  AND token = 'F1xBon9/Ft2ArqpoJ6sNXf0PvZQSLH8Ih5hltjaXhE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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