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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929ab5132c07bd0a09388b00c48ea45cb71ad24a6a2a6bea1680f75f0a6303ab' 
  AND token = '6c//Kv8QwX9lRFlU7shetZPFsuoi2WCxYkaaNHG/6S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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