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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98577c27db5b67eb0365c60fc7c554426e66924ee3415e1c772bfb6ff4fec9b9' 
  AND token = '6x9plSvP28leOYrPjOjCRYC5DgFHtxiyUMIPQVaUpp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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