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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d1fd0dc5b09eb7fd409f0b46a8fa3362c7f45e63addf5b4ce1a1d45d310982' 
  AND token = 'jrx7EAIbQiybOa732V6lIepqUkFjOdGMfmnM5LkB9Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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