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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c92f1fc44c4a376c232f0b5ace0406580268e6e338706560c3078fdfaf86dca' 
  AND token = 'lRvYWx15E2dcy6nmIASwR13FoX/ztA499cEOU/cg8xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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