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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365242fdb7fa4c890fcbe8649557013411e4bf39958261ca3107a1141fd43c3e' 
  AND token = 'pcbD0rSEQQcAC3bhw1TrzdxLCBmxSiwjVo0I/kK4zBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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