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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7b8e9aa6c00d592a1a9f9c45617fdc350f70cb9aed6fd48efef8c780585301' 
  AND token = '4M7QiHNiLTD+a/GtzUcTcGU8alYlg1Lsyr4o761MkjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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