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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95aaa00ce4fd48da6f92e10f623c0514a71e6ee53d19be949defe050a08855a' 
  AND token = 'BTyjUI0+4J3FIhjEiz189LcQ7NUxjhqowBlHeQrxJqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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