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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bddbccd24e7312d70322aaa035adfee25f150892b16e3c3a77a7f0741d40e6d5' 
  AND token = 'Kw1rkyr3Xq/xEzcu/Of7YwTcXMwNdDLNdsgO64vDn4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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