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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b076bf0518cc658d8b5455931b7dbdf85797ad0059d994aae50a746057f54cc' 
  AND token = '4Hcc92Hj0k3jQExJ73mGmQqVZnk8UBy9rcG2chDjSG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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