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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf6302eca6bccf9ecaaafb900f3a99b8fe17bf40981c770fecf509f64ba73c0' 
  AND token = 'DR3Eygf8eruoz3CxChEgbVmA39/nMiwa+epbeTwcRxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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