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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2b8d861e7174e8fff24d0bd003ec3b30d33bacc3ab220db056f53741384d9e' 
  AND token = '/TaPMhN04AOlg7CcnBPJ/7XA8WJmT7ui7BXdod37+sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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