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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702c456f44d6fe177615456402fc71d188eb463e6d3b46378968b3f468eb11d8' 
  AND token = 'SWrknknkW6AqtHtwPTC6M16G9jmMFGSnGSWRyRsEON0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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