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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599c430f309ef49d1552c7ee5d76dc915e112c6e3eb6b84ad84b831304e31bf3' 
  AND token = 'qAhd81j5npyF5mbJ0v1EJEgZWQrofSlbHJGNrqrRuxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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