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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c2dbc6de00009bc234464eb1a3ffe26bbb5eceeffa67c0457670be8d2d3c41' 
  AND token = 'qrMeutHqlHu5xrNFQyMavQxq6JfPvJSNfmVFC0glCzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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