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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911bb6b999e668cdd9628efded8ff593ee60df7e0f19bd8f421fda0a15b318af' 
  AND token = 'Fuxn/XXXPZuDsLzSJPg9i7JbIGuJQTHcmLggn0wQ/bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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