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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bdf347f44d0053c8d68bc0dcfa398fb0e58e228366c01f37717539895747d37' 
  AND token = '7SS7QU/+DpkxBIS5EkJ5PN0zaJTv2hfpG8kg1BNGIKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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