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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977eaac6ae7840902a8de91794894ceb612c7f60a8f98545b01ca5285a9dad04' 
  AND token = '729RofPCrEIRJRcy5B3uxUHGpxXOCb5HZ8J20ewpCXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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