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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7719761ddb829c8a7bd495bd7b4db53654ade6ed04f0d4be0642286531a19cd' 
  AND token = 'hi2HAAonTpJRxoH5z2teXf8snBaH/DVSeHInZrm06J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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