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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e46466cd8d760c7ddf9d8866d7d70c05dfacd6e00e6a8af30854bb1b2dcc04' 
  AND token = 'mz6Ea8LwkNRJiF2G+J3AV1OY2/rHw5oAQZgUtDgarus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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