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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73021e94000ec5c7d08906546bbe0168ccc5850de919a1317e0c439b29aa80cc' 
  AND token = 't7J0ztcPJcaYVii3Zve8UDow1yO8bK/T5R6iCp3Sjo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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