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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbe02c2fe9a79fa0e7351719ee901103ff5a5096814807ff04e0588f3a17aa7' 
  AND token = '7uBTczGmYO1TCenJzLxY79ntmv6lmFCIvpVJucEnkXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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